Journal
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
Volume 58, Issue 6, Pages 650-656Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0036023613060211
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- Federal target program Scientific and Scientific-Pedagogical Personnel of Innovative Russia [02.740.11.0628]
- Ministry of Education and Science of the Russian Federation
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Methods of synthesis of iron(II) complexes containing cluster closo-borate anions-[Fe(Htrz)(3)]B10Cl10 (I) (HTrz is 1,2,4-triazole), [Fe(NH(2)Trz)(3)]B10Cl10 center dot 2H(2)O (II) (NH(2)Trz is 4-amino-1,2,4-triazole), [Fe{HC(pz)(3)}(2)]B10Cl10 (III), [Fe{HC(pz)(3)}(2)]B10H10 (IV), and [Fe{HC(pz)(3)}(2)]B12H12 center dot 2H(2)O (V) (HC(pz)(3) is tris(pyrazol-1-yl)methane)-have been developed. The compounds have been studied by the static magnetic susceptibility method (78-500 K) and electronic, IR, and EXAFS spectroscopy. Complexes I and II in the temperature range under consideration remain in the high-spin state. Low-spin complex III shows incomplete spin crossover and decomposes on heating above 440 K. Complexes IV and V are characterized by reversible spin crossover (1) A (1) a double dagger (5) T (2) accompanied by thermochromism (the pink a double dagger white color change). The crossover temperature (T (c)) for IV and V is 375 and 405 K, respectively.
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